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A student forgot to add the reaction mix...

A student forgot to add the reaction mixture to the round bottomed flask at `27 ^(@)C` but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was `477 ^(@)C.` What fraction of air would have been expelled out?

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`V_(1)/T_(1)=V_(2)/T_(2)`
`T_(1)=27+273=300 K`
`T_(2)=477+273=750 K`
`V_(1)/300=V_(2)/750`
`V_(1)/V_(2)=300/750=2/5`
Fraction of air expelled `=1-2/5=3/5`
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